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All-optical phase-preserving multilevel amplitude regeneration

MPG-Autoren
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Roethlingshoefer,  Tobias
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Onishchukov,  Georgy
Optical Communication, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Schmauss,  Bernhard
Schmauß Group, Associated Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Leuchs,  Gerd
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Zitation

Roethlingshoefer, T., Richter, T., Schubert, C., Onishchukov, G., Schmauss, B., & Leuchs, G. (2014). All-optical phase-preserving multilevel amplitude regeneration. Optics Express, 22(22), 27077-27085. doi:10.1364/OE.22.027077.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002D-6482-0
Zusammenfassung
The possibility of all-optical phase-preserving amplitude regeneration for star-8QAM is demonstrated using a modified nonlinear optical loop mirror. Experiments show a reduction in amplitude noise on both amplitude levels simultaneously, considering two different types of signal distortions: deterministic low-frequency amplitude modulation and broadband amplitude noise. Furthermore, using this amplitude regeneration, the robustness against nonlinear phase noise from fiber nonlinearity in a transmission line is increased. The scheme suppresses the conversion of amplitude noise to nonlinear phase noise. This is shown for simultaneous amplitude regeneration of the two amplitude states as well as for amplitude regeneration of the high-power states only. If the transmission is limited by nonlinear phase noise, single-level operation at the more critical higher-power state will benefit because of the wider plateau region. Numerical simulations confirm the experimental results. (C) 2014 Optical Society of America.